Submission #382441

#	Time	Username	Problem	Language	Result	Execution time	Memory
382441		BartolM	Bigger segments (IZhO19_segments)	C++17	100 / 100	121 ms	18952 KiB

segments

#include <bits/stdc++.h>

using namespace std;

#define X first
#define Y second
#define mp make_pair
#define pb push_back
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <int, pii> pip;
typedef pair <pii, int> ppi;
typedef pair <ll, ll> pll;

const int INF=0x3f3f3f3f;
const ll MAX=(ll)INF*INF;
const int N=5e5+5;

int n;
ll pref[N], p[N], dp[N];
int lef[N];

void solve() {
    pref[n+1]=MAX;
    lef[0]=0; dp[0]=0;
    for (int i=1; i<=n; ++i) {
        lef[i]=max(lef[i], lef[i-1]);

        dp[i]=dp[lef[i]]+1;
        ll br=2*pref[i]-pref[lef[i]];
        int nx=lower_bound(pref, pref+n+2, br)-pref;
        lef[nx]=i;
    }
    printf("%lld\n", dp[n]);
}

void load() {
    scanf("%d", &n);
    for (int i=1; i<=n; ++i) {
        scanf("%lld", &p[i]);
        pref[i]=pref[i-1]+p[i];
    }
}

int main() {
    load();
    solve();
    return 0;
}

Compilation message (stderr)

segments.cpp: In function 'void load()':
segments.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
segments.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |         scanf("%lld", &p[i]);
      |         ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27